Related Manuals for Huazheng HZDW-DB
Summary of Contents for Huazheng HZDW-DB
- Page 1 HZDW-DB Ground Network Earth Resistance Tester User Manual Huazheng Electric Manufacturing (Baoding) Co., Ltd...
- Page 2 (0312) 6775656 to tell you to serve you at all times- Baoding Huazheng Elect ric Manufact ur ing Co. , Lt d. , our company will def initely make you satisf ied !
-
Page 3: Table Of Contents
Contents I.Use safety measures........................2 II.Instrument overview........................2 III.Functional features........................3 IV.Main Technical index......................... 4 V.Instrument principle........................5 VI.Panel introduction........................6 VII.Measurement wiring........................7 VIII.Operating steps........................8 IX. External power use......................... 17 X.Measure ground continuity...................... 18 XI.Measuring soil resistivity......................19 XII.Measurement of ground grid resistance by angle method..........20 XIII. -
Page 4: I.use Safety Measures
I.Use safety measures 1. Be sure to read this manual carefully before using this instrument. 2. Test personnel should have common sense of using general electrical equipment or instruments. 3. The tester must strictly abide by the safety operation regulations, and must fully understand the high-voltage test circuit and the main points of the instrument operation. -
Page 5: Iii.functional Features
The ground net w ork ear t h res ist ance tes ter adopts a new variable frequency AC power supply, and adopts a microcomputer to control the earth network ground resistance tester and signal processing. It solves the anti-interference problem during the test and simplifies the test operation process. -
Page 6: Iv.main Technical Index
testing can be completed with a light touch. 6. Equipped with a calendar chip and a large-capacity memory inside, the results can be saved at any time. The history record can be viewed at any time, and can be printed out. The current time and storage time can be displayed and printed. -
Page 7: V.instrument Principle
60±0.1Hz to 60±10.0Hz can be set freely 7. Output current: 5A or external power supply 30A 8. Output voltage: 400V or external power supply 1000V 9. Measuring line requirements: Current line copper core cross-sectional area ≥1.5mm2 Voltage line copper core cross-sectional area ≥1.0mm2 10. -
Page 8: Vi.panel Introduction
VI.Panel introduction Figure 2 Panel diagram 1: Current pole (C1) 2: Voltage pole (P1) 3: Voltage pole (P2) 4: Grounding grid (C2) 5: Current pole (C11) 6: Voltage pole (P11) 7: Voltage pole (P22) 8: Grounding grid (C22) 9: External AC power supply 10: External AC power supply 11: Grounding pole 12: 220V power socket... -
Page 9: Vii.measurement Wiring
VII.Measurement wiring Figure 3 Three-pole method measurement wiring diagram 1. Measuring current wire D: wire diameter ≥ 1.5mm2, length is 3 to 5 times the diagonal length of the ground net; 2. Measuring voltage wire 1: current wire with wire diameter ≥ 1.0 mm2 and length 0.618 times;... -
Page 10: Viii.operating Steps
grid C2 of the instrument respectively, and then perform the test according to the measurement procedure. VIII.Operating steps 7.1. Preparation before operation 1. First check whether the current line, voltage line and ground network line used for the test are disconnected (can be measured with a multimeter), whether the rust on the ground pile is cleaned, and whether the buried depth is appropriate (>0.5m), and check at the same time Check whether the connection between the test line and the ground stake is connected. - Page 11 Figure 5 Boot interface 2. Test parameter selection explanation 1) Test frequency: 50.0±5.0Hz means using 45/55Hz double frequency conversion test. Generally choose 50±5Hz or 60±5Hz in field test. Of course, you can choose something else. If you want a single frequency such as 50Hz test, you can choose 50.0±0.0Hz. Here the frequency value is set freely in the range of 40-70HZ.
- Page 12 Figure 6 Test mode selection 3) Internal power supply: here is a drop-down menu, you can choose internal power supply or external power supply. (Picture 7) Figure 7 Internal and external power supply selection 4) Test current: 2.0A represents the value of the test current. The current value here can be set arbitrarily, such as 2.2A.
- Page 13 Test current selection (normally only to 5A, 20A needs to be customized) 5) Grounding resistance wire length: the wire length when testing grounding resistance, generally choose 20 meters. 6) Design short-circuit current: The current when a single-phase short-circuit occurs during the design of the substation. Generally 1kA. 7) Under the boot interface (Figure 5), the red numbers are modified.
- Page 14 Figure 10 Test confirmation interface Click OK to start the up-current test. Please confirm that the test line has been connected. At this time, the ground network test interface will appear (Figure 11). Click Cancel, and the instrument will return to the startup interface (Figure 5). Figure 11 Ground network test interface I=2.000A Instantaneous current during the test.
- Page 15 Figure 12 Ground network test result interface The meaning of the measurement results is as follows: Zx = 75.777mΩ: ground network impedance value Rx = 75.770mΩ: pure resistance of the ground grid Φ = 0.769°: vector angle value X = 0.001Ω: ground network inductance value L = 0.003mH: ground grid inductance value Press exit at this time to return to the boot interface (Figure 5).
- Page 16 Data storage interface (Figure 13) 7.4 Ground resistance test In the boot interface (Figure 5), select the ground resistance test mode, (the line length is generally 20 meters) use the touch screen pen or finger to click to start the instrument test, the test confirmation interface appears (Figure 14): Figure 14 Test confirmation interface...
- Page 17 I=2.002A instantaneous current during testing. U=0.153V The instantaneous voltage during the test. R=0.076Ω instantaneous impedance during testing. F=55.00Hz constant current source frequency (double frequency conversion F1) F=45.00Hz constant current source frequency (double frequency conversion F2) Progress: 84% means 84% of the test is completed, etc. To 100% test is completed.
- Page 18 Figure 16 Ground resistance test result interface The meaning of the measurement results is as follows: R = 76.138mΩ: Grounding resistance value ρ=9.567Ω.m: soil resistivity value I=2.000A: Test current value U=0.152V: ground voltage value Press exit at this time to return to the boot interface (Figure 5). Press print to print out the result.
-
Page 19: External Power Use
2) [Power module error, please contact the manufacturer], if the test continues, please contact the manufacturer. 3) When the test current is 0.0A, the connection of the [current line] may be in poor contact with the [current pole] ground pile or there are too few ground piles. It is necessary to add ground piles to reduce loop resistance. -
Page 20: X.measure Ground Continuity
1. When using an external power supply, you only need to wire it as shown above. 2. Turn on the machine and select the external power supply on the initial interface. 3. Set the frequency so that the frequency is equal to the frequency of the external power supply. -
Page 21: Xi.measuring Soil Resistivity
XI.Measuring soil resistivity Using this instrument, you can use the unipolar method or the quadrupole method to measure soil resistivity. The following uses the quadrupole method as an example. The wiring for measuring soil resistivity is shown in Figure 12. Figure 12 Wiring diagram for measuring soil resistivity by four-pole method In the figure, a is the distance between the current electrode and the potential electrode,... -
Page 22: Xii.measurement Of Ground Grid Resistance By Angle Method
XII.Measurement of ground grid resistance by angle method Under normal circumstances, the ground impedance test of large-scale grounding devices adopts the angle arrangement of current and voltage lines. Generally, the distance dCG between the current post C and the edge of the tested grounding device should be 4 to 5 times the diagonal length of the ground grid;... -
Page 23: Packing List
XIII. Packing List Name Main engine Power line Ground stake Ground lead Voltage lines (P1 yellow, P2 green) each Current wire (C1 red, C2 black) each 5m Fuse pipe (built-in) Print paper Note: Please do not disassemble the instrument, including the panel. Because it may break the internal connection line of the instrument and cause the instrument to malfunction. - Page 24 d) test should comply with site safety regulations, Lei Yun should stop testing and evacuate the test site when moving above the tower. 7.2.1 test methods The method and principle of measuring the grounding impedance of transmission line tower grounding device by three-pole method are basically the same as that of substation grounding device, see figure 7.
- Page 25 method refers to 6.2.1.2. if the laying path is narrow, the straight line method can be used, otherwise, the angle method can be used. a) straight line method. Usually the current pole C the straight line distance from the edge of the tower foundation dco take 3 D~4 if the soil around the earthing device is more ...
- Page 26 7.3.2 test methods All grounding lead lines of the measured tower are removed and short connected with metal as the test lead of the grounding device. A test instrument is connected to the circuit formed by the grounding device, the grounding device tower, the lightning protection line, the remote multistage tower and its grounding device and the earth, as shown in figure 8, which generates the test current and measures the Z’tj.
Need help?
Do you have a question about the HZDW-DB and is the answer not in the manual?
Questions and answers